HP XP Data Shredder Software - Manual (Page 30)

Figure 8 Alternate path mode is Single mode with alternate paths in Standby only
NOTE:
External arrays with Active/Standby (A/S) controllers, such as the MSA, are an example of Figure 8 .
A notable characteristic of using A/S controller arrays as external storage is that there is typically
only a single port to the owning controller. Paths to the non-owning external controller's ports are
shown as Standby status. I/O load balancing does not occur across external controllers.
Powering arrays on or off
This section describes procedures for powering local and external arrays on or off after External Storage
XP operations have started.
The procedures below will utilize the following commands:
• Disconnect Subsystem
Execute the Disconnect Subsystem command from the Command View XP or XP Remote Web Console
GUI when you need to perform maintenance or stop the local or external array. This command stops
acceptance of all host I/O operations to the external LU mapped as the internal LDEV. All outstanding
data in cache memory on the local array intended for the external LU is written (de-staged) to the
external LU.
For instructions on executing the Disconnect Subsystem command, see
Disconnecting external arrays
or LUs .
30 Preparing for External Storage XP operations